[turbofan] Do constant folding for Float64Pow.

test/unittests/compiler/machine-operator-reducer-unittest.cc

Index: test/unittests/compiler/machine-operator-reducer-unittest.cc
diff --git a/test/unittests/compiler/machine-operator-reducer-unittest.cc b/test/unittests/compiler/machine-operator-reducer-unittest.cc
index b81ec2f3c568d41af52fa2a45f811ed851716408..318738eb34303edfd035d99068877f3538ae8c2e 100644
--- a/test/unittests/compiler/machine-operator-reducer-unittest.cc
+++ b/test/unittests/compiler/machine-operator-reducer-unittest.cc
@@ -1772,6 +1772,21 @@ TEST_F(MachineOperatorReducerTest, Float64Log1pWithConstant) {
 }
 
 // -----------------------------------------------------------------------------
+// Float64Pow
+
+TEST_F(MachineOperatorReducerTest, Float64PowWithConstant) {
+  TRACED_FOREACH(double, x, kFloat64Values) {
+    TRACED_FOREACH(double, y, kFloat64Values) {
+      Reduction const r = Reduce(graph()->NewNode(
+          machine()->Float64Pow(), Float64Constant(x), Float64Constant(y)));
+      ASSERT_TRUE(r.Changed());
+      EXPECT_THAT(r.replacement(),
+                  IsFloat64Constant(NanSensitiveDoubleEq(Pow(x, y))));
+    }
+  }
+}
+

[ahaas, 2016/09/12 10:45:23]

Nit: could you add a test for x ** +-0.0 => 1.0?

[Benedikt Meurer, 2016/09/12 10:52:03]

Done.

+// -----------------------------------------------------------------------------
 // Float64Sin
 
 TEST_F(MachineOperatorReducerTest, Float64SinWithConstant) {